Not around my OT right now, but I think deleting the bank through file manager would be best off. Not sure if it would have any side effects, would be best to test with a fresh project. Same method as the following article, just delete instead of renaming or copying.
EDIT: Mainly I’m not sure if the file structure has blank files associated to the banks, if it does, copy/paste the blanks, if not, deleting should be fine.